Claude Code may have produced a Rust SPARQL extension for SQLite, value unclear
Using Claude Code in "Ultracode" mode, the author prompted the system to write a SQLite extension in Rust that embeds SPARQL 1.1. The AI generated dozens of Rust crates over more than 12 hours of work, and the author later asked it to add documentation, a tutorial, and a data‑population script.
Key points
- Claude Code was run in Ultracode mode for over 12 hours to generate a Rust SQLite extension
- The extension implements SPARQL 1.1 and can delete rows directly inside SQLite
- Author is unsure of the extension's practical value and notes the code is hard to review
The resulting code appears to be a full SPARQL implementation that can run inside SQLite and directly delete rows, but the author admits the project is difficult to review and questions how valuable it is given the time invested and the lack of a deeper understanding of its capabilities.
Model page: Claude Haiku 5.5 →
sparqlite: SPARQL 1.1 inside SQLite, written in Rust
Simon Willison · 16 October 2026Loading the full article…
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